#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int a = 0;

    while (scanf("%d", &a) != EOF) {
        if (a > 0)
        {
            printf("1\n");
        }

        else if (a == 0)
        {
            printf("0.5\n");
        }

        else
        {
            printf("0\n");
        }

    }

    return 0;
}